Congruent phase transition at a twist boundary induced by solute segregation

D. Udler, D. N. Seidman

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


A congruent or 2D structural phase transition is observed, via Monte Carlo simulations, in a Σ = 5/(002) twist boundary that is induced by segregation of Ni from the bulk of a single-phase Pt(Ni) alloy bicrystal. This segregation induced phase transition, at 850 K, is from the coincident site lattice (CSL) structure to the type 2 structure, which involves a change in the space group from p421∲2′ to p42′2′. For bulk concentrations up to 0.6 at. % Ni the boundary has the CSL structure, while for a bulk concentration of 7 at. % Ni the type 2 structure is stable. Evidence is presented for chemical ordering at this interface.

Original languageEnglish (US)
Pages (from-to)3379-3382
Number of pages4
JournalPhysical review letters
Issue number16
StatePublished - 1996

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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